Glass Insulators

Product Description

Glass Insulator

The device used to support and insulate the wire is called an insulator. The insulator device is made of glass and is called a glass insulator; the most widely used in the line is the tempered glass insulator.

Insulators are generally made of glass and porcelain. Mainly used to fix the wire in the pole, etc., and make the wire and pole, etc. insulation. Insulators are one of the key components of high-voltage transmission lines, and their performance directly affects the safety of the entire transmission line. Glass insulators are widely used because of their zero value self-breakage and easy maintenance.

Specification

Standard glass insulator, Anti-Fog/Anti-Pollution glass insulator, Aerodynamic glass insulator all could be supplied in our company, if you have any demand for the Anti-fog/Anti-Pollution toughened glass insulator, pls contact us freely.

Advantages

In the first few years of production and operation, glass insulators have been found to have the following advantages over porcelain insulators:

Because of the high mechanical strength of glass insulator surface, the surface is not easy to crack. The electrical strength of glass generally remains the same throughout the operation, and its aging process is much slower than that of porcelain. Therefore, glass insulators are mainly scrapped due to self-damage, which occurs within the first year of operation. However, the defects of porcelain insulators are only discovered after several years of operation.

The use of glass insulators eliminates the need for periodic preventive tests on live insulators during operation. This is because every type of damage to tempered glass causes damage to the insulator, and operators can easily spot it while patrolling the line. When the insulator is damaged, glass shards near the steel cap and iron foot get stuck, and the mechanical strength of the remaining part of the insulator is strong enough to prevent the insulator string from breaking. The self-breaking rate of glass insulator is one of the important indexes to measure the product quality, and it is also the quality basis of the current bidding and bidding for transmission projects.

Performance of Glass Insulators

Ceramic insulators due to the use of slurry pressing, sintered ceramic materials as insulators, the internal material homogeneity and surface toughening strength and the complexity of the insulator structure shape in industrial production are difficult to be fully guaranteed, which greatly affects its performance requirements. On the contrary, tempered glass insulators use borosilicate (or aluminosilicate) tempered glass with high softening temperature and homogeneous and stable physical and chemical properties as insulators, making full use of the inherent characteristics of glass, the performance of tempered glass insulators is particularly outstanding in the following aspects:

1. Excellent dielectric properties and no aging phenomenon

The insulator insulation performance is very much related to the internal molecular structure of the insulating material. Glass belongs to the non-crystalline structure, is no fixed melting point of silicate compounds, dense structure, uniform texture, produced in a continuous production process that can be easily controlled to eliminate the artificial influence of production personnel on the performance of insulators. s102 is the skeleton of the composition of the glass, other atmospheric compounds filled in the skeleton, and connected by chemical bonds, the interaction is large, not easy to be polarized by the electric field, showing a good inert, is the ideal The insulating material.

2. Good mechanical properties and temperature difference resistance

When the glass body is still in a high temperature state after pressing and forming, the surface of the glass body is blown by controlled cold air to make it cool down suddenly, thus producing uniform pre-stress, so that the internal contraction of the glass body due to the cold produces internal tension, and this tension makes the surface of the glass body appear a permanent compressive stress. After the tempering process, the glass body has greatly improved its ability to resist mechanical shock: In addition, when a single short circuit occurs in the transmission line, a large short-circuit current will be generated, which requires insulators to have good arc resistance, but also requires that the tensile strength can not be reduced. Toughened glass insulators arc resistance than porcelain insulators, while the tensile strength is not significantly reduced.

In addition, tempered glass insulators have excellent resistance to temperature differences because of the metal accessories, tempered glass and... 15:51:10

The cement glued together has a relatively close coefficient of thermal expansion. Therefore, tempered glass insulators have better temperature difference resistance than porcelain insulators. Qualified tempered glass insulators, the insulator structure is uniform, the surface compressive stress (up to 250MPa), can withstand a large temperature difference under the specified constant mechanical load of continuous cyclic impact, indicating that the tempered glass insulators have the ability to withstand long-term mechanical loading and atmospheric temperature changes in actual use.

4. "Zero value" self-detonation and good tensile strength of the residual section

The characteristic of "zero value" self-detonation is the most significant feature of tempered glass insulator that is superior to other insulators. Compared with porcelain insulators, tempered glass insulators are free of hidden defects and do not need to be tested as long as the glass body is intact, which provides a great convenience to line operation and inspection departments for timely detection. The glass insulator stubs still have good tensile strength after self-detonation. The electrical properties of the residue is also reliable, even if there is too high an electrical stress, such as overvoltage caused by flashover across the insulator string including the residue, the internal arc is prevented by the head of the residue is very tightly pressed glass particles, and the arc is completely outside. So it will not cause the malicious accident of line drop. When the glass insulator in the self-breaking, the ground broken glass is irregular particles, the particles check through the spoon 10mm. The insulator string below the electrical equipment, the particles fall on the equipment, the sex times scattered in a large range. The diameter of up to 34) m. The glass insulator string hung below the frame, there are oscilloscopes, blowout preventers isolated from raising, coupling capacitors, including the main transformer and other electrical equipment, the glass particles will not break the electrical equipment.

5. Long life and good electrical performance

Insulator glass parts by toughening treatment (760% 780C) to obtain a uniform distribution of toughening internal stress, it is a permanent stress, will not decline with the extension of the commodity running time. The maximum temperature of the line operation is 70~80C, which is far below the annealing temperature of the glass; in case of lightning strike or dirty flash, although the arc temperature can reach more than 3000C, but the burning arc time is very short, and the glass is not likely to anneal immediately. Therefore, the glass insulator has a long life cycle and not easy to aging characteristics is based on science, at the same time, the average breakdown strength of tempered glass media up to 1700kV/cm, such as lightning burns the glass surface (depth 1-2mm) without injury and iron cap, steel foot, the product can continue to use. While the porcelain insulator burns porcelain enamel and synthetic core rod, these two products must be replaced. Therefore, the electrical strength of glass insulators is quite stable throughout the operation, and the electrical properties do not age.

In addition, the raw materials used to manufacture glass insulators, in terms of its own composition, more stable than the raw materials used in the manufacture of electric porcelain, to stabilize the electrical properties of glass and mechanical properties to create good conditions. In addition, the construction of glass insulators manufacturing plant investment than the construction of porcelain insulators factory investment is much less. Therefore, the price of mass-produced glass insulators is lower than that of porcelain insulators, and their size and weight are much smaller than that of porcelain insulators. However, due to the light weight of glass insulators, the "white breakage" rate of glass insulators is higher due to the manufacturing process, which is the fatal drawback of glass insulators. Recently, tempered glass insulators are gradually being used in transmission lines. After more than 40 years of field operation, the many advantages of glass insulators have been widely recognized and widely promoted and adopted.